The mass ratio is degenerate with the spin [1]}, [2]}, [3]}.
Fixing spins to be zero breaks the mass–spin degeneracy results in a more equal mass ratio and a larger \(m_2\)  for a system of a given chirp mass.
However, the inclusion of the zero-spin subcomponent makes little difference for our inferred mass ratio distribution, with the posterior for the power-law index \(\beta _q\)  being largely determined by our assumed prior.
